Replacement trailer wiring harness for vehicles originally equipped with a factory installed tow package – perfect for replacing or upgrading a damaged or missing factory harness. Quick and easy plug-in installation – no cutting or splicing necessary; simply plug into the existing vehicle connectors, insert the provided jumper harness and relays and you’re ready to start towing. Includes jumper harness with specific relays required for proper trailer taillight function; not compatible with 2008 – 2012 Nissan Pathfinders factory equipped with a 4-flat harness. Simple, easy to follow, do-it-yourself instructions, with photos, included in every package.